Element for a toy building set



FIG. 1 is a top perspective view of my design for an element for a toy building set in accordance with the present design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof. 

The ornamental design for an element for a toy building set, as shown and described. 